4. Put a sticky-note on the underside of a computer mouse so that when the person goes on the computer, the mouse won't work.
5. Put pop-its under the toilet seat so that when someone sits down, it will make a bunch popping noises and, again, freak them out.
6. Place a plastic cockroach on the inside of a lampshade so when's the light turns on , it will look like there is a big ol' cockroach in the lamp
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These are awesome.

Do continue!
